PR :: Andrew Jarrett

README.md

@@ -1,4 +1,4 @@
 # Sprint Challenge: Computer Security and Theory of Computation
 
 * [Improve your practical personal security](security/)
-* [Theory of Computation](theory/)
+* [Theory of Computation](theory/)

theory/solutions.js

@@ -0,0 +1,54 @@
+/* 
+ * Find regexes that match the following. (e.g. find a 
+ * single regex that matches both `antelope` and `antelopes`.)
+
+ * Single regex that matches either of these:
+
+ *    antelope rocks out
+
+ *    antelopes rock out
+ */
+
+let firstRegex = /antelope(s rock| rocks) out/
+console.log(firstRegex.test('antelope rocks out')) // => true
+console.log(firstRegex.test('antelopes rock out')) // => true
+
+/* Regex that matches either of:
+
+ *    goat
+
+ *    moat
+
+ * but not:
+
+ *    boat
+ */
+
+let secondRegex = /[gm]oat/
+console.log(secondRegex.test('goat')) // => true
+console.log(secondRegex.test('moat')) // => true
+console.log(secondRegex.test('boat')) // => false
+
+/*
+ * Regex that matches dates in YYYY-MM-DD format. 
+ * (Year can be 1-4 digits, and month and day can 
+ * each be 1-2 digits). This does not need to verify 
+ * the date is correct (e.g 3333-33-33 can match).
+
+  2000-10-12
+
+  1999-1-20
+
+  1999-01-20
+
+  812-2-10
+ */
+
+console.log('\n')
+
+let thirdRegex = /\d{1,4}-\d{1,2}-\d{1,2}/
+console.log(thirdRegex.test('2000-10-12'))
+console.log(thirdRegex.test('1999-1-20'))
+console.log(thirdRegex.test('1999-01-20'))
+console.log(thirdRegex.test('812-2-10'))
+